Rotary percussive tool.



C. H. HAESELBR. ROTARY PBRGUSSIVE TOO..

APPLICATION FILED MAY 27, 191s. l 074,1 6, Patented Sept. 30, 1913.

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03H. HAESELBR. ROTARY PERGUSSIVE TOOL. APPLIOATION FILED MAY 27,1913.

1,074; 1 6, l Patented sept. so, 19.13.

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C. H. HAESELER. ROTARY PERCUSSIVE IIJOOL. `MPPLUJATION FILED MAY 27,1913.

1,074,116. Patented sept. 30,1913.

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n rHILA-nnpjrila, PENNSYLVANIA ROTARY rnncussrvi: -rroorif VToaZZw/Lom-z' may concern:

Be it known that I, CHARLES I-I. Hansa- LER, a citizen of the UnitedStates, residing in the vcity ofPhila'delphia, county of Philadelphia,and State of Pennsylvania,.

haveinvented certain Improvements in Rotary Percussive 'Tools, of whichthe following is a specification.'

My inventionis designed toprovide improved mechanism for automaticallyrotating drills, bits or upsetting devices of percussive tools,particularly thel cutting devices of pneumatic hammer drills.

Mechanisms hereto-fore employed for Vrotating drills have been defectivein their operations because," among other reasons,1

they have lacked the capacity to eifect the desired turning movement, onaccount of the close relation of themotor to its work and the characterof the means by which it is actuated. Particularly .in .producing theturning movement by a fluid motor, the cylinder and piston employed havebeen disposed vand connected so that the clutch mechanism to be operatedfails to engage 'upon defective act-ions or short strokes of the pistonwhich result from the condensation 0f moisture in the air, theaccumulation of dust, andthe limited timethe uid acts upon the piston. v

The leading purposes of my improvements are to avoid these detects .ofthe priorV art and to provide an etliciet mechanism ca-' pable ofeilecting 'the desired intermittent rotary movement, which I am enabledto do by means comprising a. clutch having a member directly connectedlto the drill chuck in front of the main cylinder containing thepercussion piston, a` fluid motor having a cylinder containing a pistonat the rear of the main cylinder, a lever having a short ann\connectedwith a member of the clutch and .a Vlong arm connected with the motorpiston so that the reductions in the stroke of the latter shall have`comparatively slight eecton the .action of the clutch insuiicient tolprevent its intended operation, and means for n iaintaining?, the motivefluid on the mo.- is'ton throughout the greater part of tor the ength of:the strokes'of the percussion fpiston' for the purpose of obtaininfracom- .plete throw of the lever and the f 'l1 of the clutchi f 'P Thismechanism is' 'characterized by 'aivlcien'cy and reliabilityof actioninggreat,

Specification of Letters Patent, Application sied May 27, 1913.

aaien' 4'the cylinder 1 yrods 55 v (whic serial no. 17.121135.:

measure to '-thescompafratively long stroke of the piston c )pe'rating4the lever, the multiplied lengthjof thelevers power arm compared withits work arm operating the clutch whereby a equate force is provided forsecuring the urning movement, and the maintenance of'the niotive fluidon the'piston during practically the full stroke of the psrcussionp'iston. l

' In the accompanying drawings, Figure 1 is a part sectional elevationof a hammerr drill embodying my improvements; Fig. 2

is an elevation of the same at right angles to that `sho-wn in Fig. 1;Fig. 3 is .a'sectional view taken on the line 3-3 of Fig. 2; ig. 4c is asectional view taken, on the line ofFig. 3; Fig. 5 is'a sectional viewtaken on the line 5-5 of Fig. 3; Fig. 6 -is a sect-ionalfview'V takenon, the line 6 6 of- Fig. 3; Fig. 7 is a diagrammatic Asectional View ofthe developed apparatus showing the relation of the parts with thepercussion'piston at the beginning of its forward stroke; .'Fig.g8zisadiagrammatic sectional viewl o-.thedeveloped apparatus showing 'Patent dsept. ao, 1913.

the relation-'ofthe parts with the percussion piston at the beginning ofits reverse movement. f f

The.' hammer drill I illustrated I,comprisesthe main c linder 1- havingthehead 3 at the rear @ndt ereof and the reducedylinder 4 fixed tothehe'ad 5 at the `orward end thereof. A piston 6 is adaptedto'reciprocate in the cylinder 1 and is provided with,

the hammer 8 adapted to reciprocate in the cylinder 4. 'Af chuck isprovided by a head 9 which engagesthe forward end of the cyl? inder 4,has tixed thereto the sleeve 10 revoluble within the' cylinder, and isscrewed into the sleeve 11 revoluble on the cylinder,

-the outer sleeve vhaving the circular flange or ring 12 at the't'opthereof-and the ratchetteeth 13 thereon. A drill shank'14 extendsupwardly through the head 9 and sleeve 10 into the cylinder 4 so thatthe rear end thereof may receivejthe blows of the hamf mer 8 'whichdrives the stem forward through such sleeve, the latter conforming tothe octagonal contour or flat surfaces of the-stem. A collar. 15 incasesthe 4flange 12 and is-prQv'idedwith an inwardly extending Vilangef- 16Awhich engages the aforesaid ila" e; the collar being supported andnormal y held in en agement .with dangle v pass throhgli lugs 57'on thecollar, and between lugs 56 and through lugs 58 on the main clyinder)and springs 59 held by such rods in engagement with the flange 16."Aclutch ring. 17, provided with ratchet teeth-;. 18' which engage theteeth13,"encircle's the cyl.-

inder 4, within the collar 15, andis pressed towardlthe fiange or ring12 blyplungers 19 actuated by springs 20, the ring-beingy provided withthe stud 22 f extendingf through the collar and having the cylindri.-

26 is fulcrumed on the stud ,27 fixedto,thev

.cal bearing 24 journaled thereon.

cylinder 1 and has at Athe'end ofSit-s' short arm a yoke 25 whichengages inconforming relation with the spherical surfacewof -the bearing24. This lever has at the end'fof, its long arm a bearing 28 journaledby `means of the stud 29 connected to the piston 30- having recessedheads 31 and-32 adapted to reciprocate in the respective cylinders' 33and 34, these cylinders being fixed to a head V sleevedv on the -rearhead of the `cylin-I -de'r 1.

screwedin the ends thereof the heads 31" The cylinders 33 and v34 haveand 32 provided with plugs 31"' and 32 adapted to enter the recessedheads.

Motive fluid is introduced by the conduitl 37 in the head 60,'to thecylinder 1, `through the screen 47 passage 38, chamber 39, asf sage 40communicating with the rear-en of l thecylinder and passage 41communicating at points between the .points of connection' ofthepassages 35 and36 with suchT cylinder. In operation lthe tool is held inposition by 'the handle 60 fixed to the head 60 and motive fluid isadmitted through the assages 37 38, 39, and 40 to the interior o the,

cylinder 1 to drive the piston 6 and hammer 8 forward and strike' theidx-ill! shank 14.1.

When this pist-on, in its forward movement, uncovers the passage 35,motive Huid is 'ad- I mitted therethrough to thecylinder 33 and movesthe piston 30 t'o the positionA shown in Fig. 7 The lever 26 is thusrocked on its fulcrumy 27 and turns the clutch `ring 17, whichpositively engages and turns the complementary clutch ring 12, therebyturning the parts 11, 9, 10 4'and 14 through the dei sired angle. Whenthe advancing piston 6 uncovers the exhaust port 43 and establishes itsconnection with the passage 35, the'cylinder 33 exhausts therethrough,and, the pas sage 44 then being covered, uid in the cylinpassagev 35.

der. front. offri-the. piston 6 is compressed .land acts through-thepassage41 to move Ithe va `ve 47 so 'as to.. establish communication--1betw e`n the passages3:8*a'ndf4L The motive Huid" nowHows'throughgtheipassage 41 to' the cylinder 1 to move the piston 6 inthe Areverse direction and through-fthe v{ iassage 36 .to the-cylinder34 to movethe pistonlBO to the position-shown 4in Fig. 8. Thisfmove-`mentof -thejpisto'n 30' rocks the lever26 and fturns thegclutchring-17,backward, the teeth `18ridingT-*over theteeth13;, Y. l'

Having nescribeamyinvenn 'Eri-sisi@ l 1.- In'a percussivirtual; thecombination-of..k

a cylinder, y a vpiston ladaptedl to` reciprocate therein, a chuckconnectedfwithfandrevcluble relatively to, said. ;'cy lind er,.clutching u means connected with said chuclg, clutching means connectedwith and. adapted forgfengaging and revolving said clutchii'igmeans rstnamed, means 4comprising a lever for oscillating said .clu,tchi'ng meanssecond -named and revolving said. clutching means first named,` andmeans whereby the reciprocation of said piston effects; -the-''oscillation of'saidlever.-

2. In apercussivej tool, a `main cylinder, a-

percussive pistonv 'adapted tofrecipro'cate therein, al revolubletool-"holder,- clutching mechanism comprising a revoluble memberconnectedwith said holder and an oscillating member adapted for engagingsaid member first named, means com rising a fulcruiiied 4 lever foroperatingsai 'oscillating member f and intermittently turning saidrevyoluhlev n member, a piston connected 4with said lever, fand-fluid.pressure means whereby said pis- Eton first named operates said `pistonsecond named. 3. In a percussive tool, a main cylinder, a

percussion y piston adapted .to reciprocate therein, a revolubletoolholder, means comprising clutchingdevices adjacent to the for ward endofsaid'cyinder' for intermittently turning said tool holder, a leverconnected with said means whereby said' clutching mechanism` isoperated, and fluid 'pressure mechanism adjacenttotherear end of saidcylinder' whereby said-'lever is oscillated.

4. In a percussive `tool,"a' main cylinder,

a rcussion.pistonl thereinf-arevoluble tool ho der, incansfd -connect'id 'said tool holder withtheforward endvof sai "cylinder, mech anism betwn the forward end 'of saidfcyiinder and said tool holder forintermittentlyf"I turning the latter, a'ever. for operating-said.-mecham'sm and turning said holder, a motor' in the rear lof saidcylinder wherebyfsai'd le"- ver is oseillated, vand luidpressure means5.' In a percussive tool,1a.`main cy `'iedergwhereby saidpistonoperates-said mc zu an auxila cylinder connected withlthe vfm1-ward end t ereof, a permissive piston in; said maiivcylinder, a han fneiadapted to hereciprocated in safari auniiary cyiinder hysaid.

iso

pistomii toolholder connected with and revoluble relatively to saidauxiliary cylinder clutching mechanism adapted to turn on sai auxiliarycylinder, said mechanism having a memberfixed tosaid holder and a membermovable ,relatively thereto, a fulcrumed lever whereby said secondmember ber tixed to said tool holder and an oscillating -member wherebysaid member first named is turned, a fulcrumed lever for opera-ting saidoscillating member, a fluid motor for oscillating said lever, and fluidpres- Copies of this patent may be obtained for sure means operated bysaid piston whereby said motor is operated.

7. In a percussive tool, a cylinder, a percussion piston therein, arevoluble tool holder, a driving device fixed thereto, an oscillatabledevice adapted for .turning said driving device, a casing containingsaid devices, a fulcruined lever, lmeans whereby said lever operatessaid oscillatable device, amotor for oscillating said lever, and fluidpressure means whereby said piston operates said motor. Y

In testimony whereof I have hereunto set my 'hand this 22nd day of May,1913, in the presence of the subscribing Witnesses.v

CHARLES H. HAESELER.

Witnesses:

Jos. Gr. DENNY, Jr., GEO. A. 'CUNNEY.

'five cents each, by addressing the Commissioner of Patents. Washington,D. C.

